Abstract

We theoretically investigate possible antiferromagnetic (AFM) orders in Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconducting phase with dx2-y2-wave paring induced by the paramagnetic pair-breaking effect. The AFM Q vector whose incommensurate part qAFM is parallel to [1,1,0] direction and independent of the field strength is obtained with the dispersion relation which have a remarkably inflected Fermi surface and the largest DOS along [1,1,0] direction. It is shown that, in a field parallel to [1,1,0], qAFM perpendicular to the field direction is stabilized as a result of the coupling between Q vector and the wavevector of FFLO modulation. These results are consistent with the observations in the high-field low-temperature phase of CeCoIn5.

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